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发表于 2019-4-8 15:04 · 广西
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本帖最后由 powerh3 于 2019-4-17 16:20 编辑
C大讨论了AMD的AM4接口的mini主机(准确说是准系统,需要自己配APU和内存 还有 NVMe固态硬盘),Asrock DeskMini A300。。。主要是想讨论14nm的Ryzen 系列APU在该准系统上的低解适配性的,如Ryzen 2200g和2400g。。。
http://forum.arcadecontrols.com/index.php/topic,159988.0.html
不过有网友说这个准系统的主板的VGA口并非真的VGA模拟接口,Win系统把它看作是DP口即DisplayPort了。所以要通过HDMI到VGA的转接器才可能实现15kHz的低解240p了,但他还没有测试。。
他的APU是A8系列的(28nm或以上),核显是R7。。
他现在改为A12的APU了。。推测是A12-9800。。
I have this mobo (with A8 / R7 graphics integrated processor).
I confirm, VGA port is not a "real" VGA analog port.
Windows view this like a DisplayPort, you will need a HDMI>VGA converter (not yet tested). ..
该贴的11楼。。
13楼,他还测试了一块普通主板AB350M-HDV R3.0,同样结果。。VGA口的应用方式主要取决于板卡厂商。。这主板和迷你准系统都是华擎的。
C大对此的回应。说到AMD的DP口不支持EDID。EDID模拟对 VGA、DVI和HDMI都支持,但是没有DP。DP很复杂,不过可以像HDMI般运行。所以可能可以通过DP->HDMI转接器实现EDID模拟,但是在该准系统小主机上不能实现了,因为DP已经被主板转换成VGA口(?,看图片除了VGA口,还有一个DP口啊,另一个是HDMI)。主板的DP->VGA,用的是类似DP->VGA dongles的转换芯片,他尝试过DP->VGA dongles,但是没有实现EDID模拟。。
但是这并不意味15kHz不可能在该VGA口上实现,只是很可能不方便实用。。C大有DP->VGA的经验,但是令人失望,有很大的像素时钟限制 还有对隔行模式支持糟糕。。
如果实在不行,就用支持EDID模拟的HDMI接口吧,加一个HDMI->VGA转接器。当然不如用VGA口直接实现那么酷了。。
Hi,
@ghost13500, thanks a lot for the information, very helpful.
AMD doesn't support EDID emulation over DP, this is confirmed by AMD. That's why it won't work. EDID emulation works for VGA, DVI and HDMI, but not DP. DP is a complex thing however, as it can act like an HDMI, so EDID emulation might work through DP as long as you use a DP->HDMI adapter, but that's not possible in this case since a DP->VGA adapter is already on board. What this motherboard likely uses is one of the chips you can find in DP->VGA dongles. I've tried those and you can't get EDID emulation on them.
This doesn't mean 15 kHz through that VGA port is not possible, it just probably won't be that convenient. My experience with DP-VGA has been very disappointing: huge dotclock limitations and terrible support for interlaced modes.
In case it doesn't work, we can always use the HDMI port that will support EDID emulation, an a HDMI->VGA adapter. It won't be as cool as using the VGA port directly but anyway. |
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